The purpose of this essay is to discuss the sonatina for trombone and piano by French composer Jacques Casterede. First of all, the writer illustrates some information of this piece, such as the biography of composer, the composer’s musical style, the background of this sonatina. Secondly, the author analyzes this sonatina, like the structure, harmony of each movement. In the end this essay will state the interpretation of this sonatina and some performance suggestions. Hopefully other students and trombones players can receive some practical information from this essay.